CVE-2026-102830

A vulnerability in JupyterLab (versions 3.0.0 through 4.5.11 and 4.6.4) and JupyterLite Core (0.8.3 and earlier) allows for the execution of arbitrary JavaScript. The root cause is a prefix-only regular-expression validation in the Plural-Forms header of certain third-party language packs, which ...

CVE-2026-102830 JupyterLab: Cross-site scripting (XSS) in JupyterLab via crafted language package (jupyterlab.json)

JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 3.0.0 until 4.5.11 and 4.6.4, and in JupyterLite Core 0.8.3 and earlier, the Plural-Forms header in a selected third-party language pack can append...

CVE-2026-102830 JupyterLab: Cross-site scripting (XSS) in JupyterLab via crafted language package (jupyterlab.json)

JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 3.0.0 until 4.5.11 and 4.6.4, and in JupyterLite Core 0.8.3 and earlier, the Plural-Forms header in a selected third-party language pack can append...